Skyjackers sway bar bushing kit is made of polyurethane. Polyurethane is a superior material that has a higher load bearing capacity and can better resist the dynamic torque, like twisting and turning forces of suspension components as they go through their normal operation and travel movements. Sway Bar Bushing Kit Limited Lifetime Warranty Brand Skyjacker Item Weight 19 pounds Manufacturer Skyjacker OEM Part Number FSB550 Item model number FSB550 Product Dimensions 44.5 x 13.25 x 4.25 inches Manufacturer Part Number FSB550 Is Discontinued By Manufacturer No